%0 Journal Article
%A V. P. Gromov
%T Nontrivial expansion of zero and representative systems of the
%J Doklady Akademii Nauk
%D 1991
%P 801-805
%V 319
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1991_319_4_a5/
%G ru
%F DAN_1991_319_4_a5